Bug#868621: haskell-hashable-extras FTBFS: Ambiguous occurrence `Hashed'

[Adrian Bunk]

Source: haskell-hashable-extras
Version: 0.2.3-3
Severity: serious
Tags: buster sid

https://buildd.debian.org/status/package.php?p=haskell-hashable-extras&suite=sid

...
Preprocessing library hashable-extras-0.2.3...
[1 of 1] Compiling Data.Hashable.Extras ( src/Data/Hashable/Extras.hs, dist-ghc/build/Data/Hashable/Extras.o )

src/Data/Hashable/Extras.hs:30:19: error:
    Ambiguous occurrence `Hashed'
    It could refer to either `Data.Hashable.Hashed',
                             imported from `Data.Hashable' at src/Data/Hashable/Extras.hs:26:1-20
                             (and originally defined in `hashable-1.2.6.1:Data.Hashable.Class')
                          or `Data.Hashable.Extras.Hashed',
                             defined at src/Data/Hashable/Extras.hs:28:1

src/Data/Hashable/Extras.hs:31:22: error:
    Ambiguous occurrence `unhashed'
    It could refer to either `Data.Hashable.unhashed',
                             imported from `Data.Hashable' at src/Data/Hashable/Extras.hs:26:1-20
                             (and originally defined in `hashable-1.2.6.1:Data.Hashable.Class')
                          or `Data.Hashable.Extras.unhashed',
                             defined at src/Data/Hashable/Extras.hs:28:24
/usr/share/cdbs/1/class/hlibrary.mk:147: recipe for target 'build-ghc-stamp' failed
make: *** [build-ghc-stamp] Error 1